Five Prenatal Tests Women Over 35 Should Consider

The other day, this piece on prenatal diagnosis appeared in my inbox.

While the CDC reports almost 15 percent of all U.S. babies -- or 1 in 7 -- were born in 2010 to women 35 and over, much tongue-clucking persists about women waiting to have a baby at "advanced maternal age." The reason may stem from data that shows certain risks (such as having a baby with Down syndrome) can increase with age. However, many women are happily embracing motherhood later on.

That said, certain tests and procedures are often recommended for women over 35. Here, 5 prenatal protocols these expectant moms may want to consider and what "older" moms who've been through them say about their experience.

The article goes on to list the 5 tests -

1. amniocentesis
2. nuchal translucency screening
3. Noninvasive Prenatal Testing (NIPT)
4. chorionic villus sampling (CVS)
5. midtrimester ultrasound

While this is a useful article as it provides background prep for moms to be for conversatons with their OB's and midwives, it lumps screening tests together with diagnostic tests, losing some perspective.

So let's look at this issue in another way. Put simply, a screening test is one which is relatively noninvasive, provides odds and stratifies risk, but does not tell you yes or no. A diagnostic test is often more invasive with real risks and answers specific questions. For example, a screening test for Down's Syndrome would yield a risk in the form of odds. A diagnostic test for Down's would yield a definitive result.

Amniocentesis and CVS are diagnostic tests. While they usually provide definitive results (with a few, thankfully rare exceptions,) nuchal translucency, NIPT and midtrimester ultrasound are more screening tests.

Also, some of these are performed in the first trimester, others in the second. NIPT, nuchal scan, and CVS are first trimester tests. The advantage here is that the earlier this hurdle is jumped, the less stressful the longer remainder of the pregnancy is.

Finally, a few words about ultrasound. IMHO, both first and second trimester ultrasound will remain standard in prenatal care, similar to early newborn physicals and the more comprehensive baby visit a month or so after birth. Many abnormalities and syndromes do not have a basis in chromosome complement, thus a test designed to screen for a chromosome issue such as Down's would not find cases of spina bifida, for example.

Prenatal ultrasound is also more than just looking at structure. It keeps pregnancy real in a tangible way for not only mom but also for dad.

For more information, or to schedule an ultrasound, please call: (718) 925-6277.